Spit-back for carburators

ABSTRACT

The present invention relates to carburators, and more particularly to a spit-back device which may be readily secured to a carburator of standard manufacture. The device in question will facilitate the mixing of the incoming air with the fuel, and also will prevent the spilling over or the release of fumes to prevent explosions. The device operates on the principle of turbulence and the elimination of waste products.

United States Patent 1 1 Heihtzelman et a1.

[ 1' Dec.3,1974

[ SPlT-BACK FOR CARBURATORS [21] Appl. No.: 264,202

[52] 11.8. C1 261/1, 55/218, 55/DIG. 28,

123/73 R, 123/142 [51] lint. C1. F02m 17/30 [58] Field of Search 261/791, D1656; 123/73 R, 142; 55/218, 240, 241, DIG. 28

[56] p A References Cited 7 l UNITED STATES PATENTS 3,231,249 1/1966Kalert, Jr. 55/DlG. 28

a a Z a 3.710.560 1/1973 Maddocks 55/510 Primary Emminer--Frank W.Lutter Assistant Examiner-William Cuchlinski, Jr.

[ 5 7] ABSTRACT lence and the elimination of waste products;

11 Claims, 10 Drawing Figures PATEME' sac 31914 SHEET NF 2 SHEH 2 0? 2SPIT-BACK FOR CARBURATORS This invention relates to automotiveequipment, and more particularly it relates to carburators for internalcombustion engines, and in the mainit provides a spitback device forcombustion engines. The invention is an improvement over the prior artand it operates on .the principle of turbulence. As the air passes athigh speed through the device it hits a number of baffle plates (in thiscase two) which are mounted in a cylindrical housing. The baffle platesare secured with one on either side of an entry channel or openings (atube) and anchored in thecylinder. The baffle plates in the cylinder aremounted in tandem one above the other and are so positioned in theincoming air as to cause the air to circulate and to cause turbulenceinside the periphery of the walls of the cylindrical housing. The invention also provides an air vent which may be located on the top of thehousing and may help to release fumes produced as the result of themixing and the circulation of air and gas. Such a vent will help releasethe fumes to the atmosphere and help prevent accidental ignition of thegas and explosions.

While the above is the main improvement of our invention over the priorart, in addition, we are providing a discharge means so as to permit allwasted fuel to pass and to be discharged to the atmosphere. This meansis arranged in such a manner as to prevent the waste from being ejectedout from the device, and into the face or the clothing of a personstanding nearby usually the op erator. This is a very importantimprovement not heretofor claimed in the prior art.

Relative to the detailed construction of our device, we are providingavent tube which may be attached to a vent hole permitting safe passageof the waste from the spit-back. Furthermore, there is a cylinder withtwo baffle plates; one baffle plate above the other in tandem. Onebaffle plate near the top of the cylinder and another located below inthe cylinder wall. The position of the baffle plates in the cylinderwill cause air turbulance. However, instead of the cylinder one mayutilize also a cone type housing with the baffle plates properly locatedin the cone one above the other one should be able to get as good adistribution of the air gas mixture as with the cylindrical housing. Thecone housing may be used for special conditions.

ever, it is clear that the device can as well operate without theshield. The shield provides added safety.

The operation of our device is simplicity itself. When the carburatorcoughs" or spits back fumes, gas or oil, the residue will be trapped inthe back side of the baffles. Afterwards this residue is sucked orpulled back into the carburator to be drained through an outlet hole oropening provided for this purpose in the bot tom of the spitback. Theabove described action also prevents pollution of the air by fumes, anddirtying and messing up of the machine and the operator, because ittraps all the oil and the gas which internal combustion engines throwoff by coughing through the carburator.

Accordingly, one object of the present invention is to provide means toprevent oil and gas in a spit-back from leaving the carburator.

Another object of the present invention is to provide a spit-back with acylindrical housing, a number of baffie plates in the cylinder with theair and fuel passing through the cylinder creating a mixture and amixing action to improve the final product of oil and air..

There is a cover. with holes to permit and to allow air to pass throughthe vent in the lower part of the cylinder housing into the carburator.The cylindrical housing may be round and elongated or round andconeshaped. Inside the housing the baffle plates are mounted one abovethe other substantialy as to be shown and described later. Furthermore,we are providing a special shield in the cylinder wall to prevent thespray of fuel from being ejected outside to endanger the operator. Theshield may be mounted in the device in such a manner as to remain in thepath of the fuel, with the fuel hitting first the shield before it isejected onto the baffle plates. However, it must be realized that we donot wish to limit ourselves to this design alone. We can visualize theshield being build within the cylinder wall, or on the outside of it.The shield may work either way, and can be just as practical andefficient.

The shield may be build in such a manner as to easily slide in-and outinto the cylinder (or cone) andlock in place to prevent it fromaccidentaly falling out. How- An additional object of this invention isto provide a baffle plate and means for mounting said plate in thedevice to prevent spit-back when the device coughs or spits fumes, gasor oil. I

This invention also contains certain other features of construction andthe combination and arrangement of several parts to be hereinafterfullydescribed, illustrated in the accompanying drawings, and in thespecifications, and specifically pointed out in the appended claims.

In describing the invention in detail, references will be had to theaccompanying drawings where like character numerals denote like orcorresponding parts throughout the several views in which:

FIG. 1 is a perspective view showing the spit-back device assembled to acarburator of standard make, personifying the embodiment of the presentinvention;

FIG. 2 is a partial cross-section or cut-away view through the spit-backillustrated in FIG. ll;

, FIG.3 is a perspective view in section showing details of thespit-back deviceand disclosing the position of the baffle plates;

FIG. 41 is a perspective view showing the spit-back with the baffles andthe shield in the proper position within the cylinder;

FIG. 5 is a perspective view of the cylinder with its baffle platesdisclosing the vent hole to prevent the cylinder from accidentalyexploding;

FIG. 6 is a perspective view of the carburator of standard make in itsrelationship to the spit back device shown in FIG. 5; I 7

FIG. '7 is a modification showing the application of baffle plates in acone-shaped spit-back cylinder;

FIG. h is a perspective view of the cone-type spitback cylinder showingthe position of the baffle plates and the vent hole;

FIG. 9 is a view showing the shield mounted in the cylinder; and

FIG. 10 is a perspective view of the cover'which keeps the cylinder inassembly and encloses the baffle plates.

DESCRIPTION More particularly-to the device embodying the presentinvention, and referring to FIG. I, it shows the manher in which thespit-back device 20, by means of a flat circular cover, and its mountingscrews 22, 23 and 24, inclusive, may be securely held to the standardtype carburator housing or casting 25. It can be seen that the spit-backmay be provided with an air vent pipe or connection 26, and an exhaustor drain pipe 27, substantially as indicated.

FIG. 2 shows the spit-back device (in upright position) and in sectionto disclose pertinent details. It can be discerned that the spit-backdevice comprises a cylindrical outer housing 20a and an innercylindrical housing 28 which in the upper end thereof has the cover 29,with a number of air intake openings 30 to permit air to enter into thespit-back device. Furthermore, the inside of the cylinder 28 (which ishollow) can be provided with a number of baffle plates, in this casetwo, 31 and 32, inclusive, which are arranged in such a manner, oneabove the other, as to be positioned in the path of the incoming air tohelp create a turbulence and to assure that the air and the incomingfuel is properly mixed before they are delivered to the engine. In FIG.2, it can be seen that the device 20 can be secured upon the carburatorcasting 25, with the latter provided with an air entry section 33.Within the section 33 there is provided a hingeable baffle valve 34which by means of the operating shaft 35 and the arm 36 can be hinged toclose and to open the air suction opening 33, by the will of theoperator.

FIG. 3 substantially is the same as FIG. 2, however, in perspective.view, showing all the details in the spitback device. It can bediscerned that the baffle plates 31 and 32 are mounted one above theother within the cylinder 28. Alsoit clearly shows the position of thecarburator valve 34 in the carburator casting 25, the operating shaft35, and the operating handle 36.

FIG. 4 is similar to the perspective view in FIG. 3, however, it furtherindicates the position of the shield 37 which prevents the pitting offuel and gas from the spit-back above described. Perspective FIG. 5clearly shows the relative positions of the baffle plates 31 and 32, andtheir relationship in thecylinder 28 and the cylinder 20a. Also itclearly shows the position of the drain pipe 27.

Perspective view in FIG. 6 indicates the relative position of thecarburator baffle plate 34 (or valve) within the carburator casting 25.Also the position of the shaft 35 and the handle 36 for operating thecarburator valve.

FIGS. 7 and 8 show the use of a cone-shaped tube 38 as an inner mixingchamber, with the narrow end of the tube being mounted against thecarburator. Cone 38 includes baffle, plates 31a and 320, as employed incylindrical chamber 28 A drain'hole 27a is also shown in FIG. 8. Thisdrain hole is positionedso that it is in the bottom side of the tubewhen it is laterally mounted on a carburator, as shown in FIG. I. Acorresponding hole 260 for air vent 26 is formed in the top of the cone.Openings 26a and 27a also are tion on the cylinder 28. I

FIG. 9 shows the manner in which the top plate or the shield 37 can bemountedwithin the cylinder or the mixing chamber 28, during assembly.The shield 37 has a pair of extensions or lugs 37a which are mounted'ina hole or an opening (see FIG. 4) in the cylinder housing to hold theshield permanently in place and to prevent its disengagement, FIG. 10indicates the shape of the circular cover 21 which by means of three (orformed in a similar posimore) holes or openings 21a may be fastened tothe device by means of screws.

The operation of the device is very simple. When the carburator coughsor spits" back fumes, gas and oil, the residue will be trapped in therear side of the baffles and be drained later through an outlet holeor adrain pipe which is provided in the bottom of the spit-back device. Theabove described action also prevents air pollution and prevents spittingof oil and gas and endangering the safety of the operator.

A careful examination of the foregoing description in conjunction withthe invention as illustrated in the drawings, will enable the reader toobtain a clear understanding and impression of the alleged features ofmerit and novelty, sufficient to clarify the construction of theinventionas hereinafter claimed. Minor changes in shape, size andmaterials, and rearrangement of parts may be resorted to in actualpractice, as long as no deperture is made from the invention claimed.

Having described our invention, we claim the followmg:

I l. A spit-back device for a carburator having an air intake opening,said spit-back device comprising:

a hollow housing mounted over the air intake opening, said housinghaving a mixing chamber therein, with the mixing chamber having inletmeans for introducing air into the mixing chamber and outlet means fordelivering said air to the intake opening of the carburator, and

spaced baffle means mounted in the mixing chamber said baffle means andand extending across a portion of said chamber preventing any fuel andresidue spit back from the carburator through the carburator intakeopening into said housing from escaping from said housing inlet means.

2. A spit-back device as claimed in claim 1 wherein the baffle meanscomprise:

at least two baffle plates mounted in the mixing chamber, said baffleplates being positioned on opposite sides of the mixing chamber andbeing spaced apart longitudinally along the mixing chamber between theinlet and outlet means said baffle plates overlapping so as to preventspitback through the inlet.

3. A spit-back device as claimed in claim 2 wherein:

chamber a sufficient distance to cause the air passing through themixing chamber to follow a generally S- shaped path in passing by thebaffle plates.

5. A spit-back device as claimed in claim 4 wherein the mixing chamberis cylindrical.

6. A spit-back device as claimed in claim 5 wherein the mixing chamberis conical, with the narrower end being the outlet means.

7. A spit-back device as claimed in claim 2 and further comprisingperforated cover means over the inlet means of themixing chamber, saidcover means being ther comprising shield means positioned in thespitback device between the carburator intake opening and the bafflemeans, said shield means being adapted to deflect fuel that is spit backthrough the carburator air intake opening before it reaches the bafflemeans.

llll. A spit-back device as claimed in claim 1 wherein the outer housingand mixing chamber comprise concentric tubular members.

I UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,52,377 .Dated December 3, 1974 Invent0 (s) Heintzelman et a1.

It is certified that error appears in the above-identified patent andthat said Letters Patent are hereby corrected as shown below:

Column 3, line 38 "pitting" should be spitting Column 4, lines 31 and 32"said baffle means and and extending across a portion of said chamberpreventing any fuel and resi-" should beand extending across a portionof said chamber and said baffle means preventing any. fuel and resi-Signed and this 11th day of March 1975.

(SEAL) At t:

tes C. MARSHALL DANN RUTH C. MASON Commissioner of Patents AttestingOfficer and Trademarks

1. A spit-back device for a carburator having an air intake opening,said spit-back device comprising: a hollow housing mounted over the airintake opening, said housing having a mixing chamber therein, with themixing chamber having inlet means for introducing air into the mixingchamber and outlet means for delivering said air to the intake openingof the carburator, and spaced baffle means mounted in the mixing chambersaid baffle means and and extending across a portion of said chamberpreventing any fuel and residue spit back from the carburator throughthe carburator intake opening into said housing from escaping from saidhousing inlet means.
 2. A spit-back device as claimed in claim 1 whereinthe baffle means comprise: at least two baffle plates mounted in themixing chamber, said baffle plates being positioned on opposite sides ofthe mixing chamber and being spaced apart longitudinally along themixing chamber between the inlet and outlet means said baffle platesoverlapping so as to prevent spitback through the inlet.
 3. A spit-backdevice as claimed in claim 2 wherein: the mixing chamber is a hollowtube having open ends, with the inlet and outlet means of the mixingchamber being the open ends of the tube; the baffle plates are attachedto the interior surface of the mixing chamber and are inclined inwardlytoward the mixing chamber outlet means.
 4. A spit-back device as claimedin claim 3 wherein the baffle plates are flat and each baffle plateextends about half way across the mixing chamber, the baffle platesbeing spaced apart longitudinally in the mixing chamber a sufficientdistance to cause the air passing through the mixing chamber to follow agenerally S-shaped path in passing by the baffle plates.
 5. A spit-backdevice as claimed in claim 4 wherein the mixing chamber is cylindrical.6. A spit-back device as claimed in claim 5 wherein the mixing chamberis conical, with the narrower end being the outlet means.
 7. A spit-backdevice as claimed in claim 2 and further comprising perforated covermeans over the inlet means of the mixing chamber, said cover means beingadapted to permit air to pass through said cover means into the mixingchamber.
 8. A spit-back device as claimed in claim 1 and furthercomprising drain means in the side of the spit-back device for conveyingfuel and residue trapped by the baffle plates out of the spit-backdevice.
 9. A spit-back device as claimed in claim 8 and furthercomprising air vent means in the top side of the spit-back device forreleasing fumes from the spit-back device.
 10. A spit-back device asclaimed in claim 1 and further comprising shield means positioned in thespit-back device between the carburator intake opening and the bafflemeans, said shield means being adapted to deflect fuel that is spit backthrough the carburator air intake opening before it reaches the bafflemeans.
 11. A spit-back device as claimed in claim 1 wherein the outerhousing and mixing chamber comprise concentric tubular members.